Headrest connecting assembly, headrest assembly and wheelchair

Abstract

The utility model relates to a headrest connecting assembly, a headrest assembly and a wheelchair. The wheelchair comprises a headrest assembly, the headrest assembly comprises a headrest connecting assembly, the headrest connecting assembly comprises a rear connecting block, a front connecting block, a first locking mechanism and a second locking mechanism, the front connecting block is located on the front side of the rear connecting block, and the first locking mechanism is used for locking the front connecting block and the rear connecting block to enable the front connecting block and the rear connecting block to clamp a transverse rod on the rear side of the wheelchair; the rear connecting block comprises a first part in the left-right direction and a second part in the front-back direction, the second part is used for being connected with the front connecting block, a clamping structure used for clamping the longitudinal rod of the headrest device is arranged on the first part, and the second locking mechanism is used for enabling the clamping structure to clamp the longitudinal rod of the headrest device. As long as the second part abuts against the right / left side of an obstacle on the cross rod on the rear side of the wheelchair, the middle line of the longitudinal rod of the headrest device is flush with or exceeds the middle line of the obstacle leftwards / rightwards, and left-right stepless adjustment of the headrest device can be achieved by turning over the rear connecting block.

Description

TECHNICAL FIELD

[0001] The utility model relates to a headrest connecting assembly, a headrest assembly and a wheelchair. BACKGROUND

[0002] Patent document CN201505240U discloses a headrest device, the lower end of the longitudinal rod of the headrest device is inserted into the back of a wheelchair for use. With the change of the structure of the wheelchair, the installation position of the longitudinal rod of the headrest device has also changed.

[0003] At present, the longitudinal rod of the headrest device of a part of the wheelchair is installed on a left-right transverse rod, and the two ends of the transverse rod are fixed on a left and right bracket for installing a handle respectively on the rear side of the wheelchair. The longitudinal rod is connected with the transverse rod through a connecting assembly to realize the left-right position adjustment of the longitudinal rod. However, after the pitch adjustment function is added to the wheelchair, the pitch adjustment mechanism occupies the middle position of the transverse rod, which leads to the fact that the left-right position of the headrest device relative to the transverse rod cannot be infinitely adjusted, and therefore, the connecting assembly needs to be redesigned. SUMMARY

[0004] In order to solve the above technical problems, the utility model provides a headrest connecting assembly for installing the longitudinal rod of a headrest device on the transverse rod on the rear side of a wheelchair, and the headrest left-right position infinite adjustment can be realized through the headrest connecting assembly.

[0005] The headrest connecting assembly comprises a rear connecting block, a front connecting block, a first locking mechanism and a second locking mechanism. The front connecting block is located on the front side of the rear connecting block. The first locking mechanism is used for locking the front connecting block and the rear connecting block, so that the front connecting block and the rear connecting block clamp the transverse rod on the rear side of the wheelchair, and the headrest connecting assembly is prevented from moving and rotating relative to the transverse rod. The rear connecting block comprises a first part along the left-right direction and a second part along the front-rear direction. The second part is used for connecting with the front connecting block. The first part is provided with a clamping structure for clamping the longitudinal rod of the headrest device. The second locking mechanism is used for clamping the clamping structure to the longitudinal rod of the headrest device, so that the longitudinal rod of the headrest device is prevented from moving and rotating relative to the rear connecting block.

[0006] As long as the second part is close to the right / left side of the obstacle on the transverse rod on the rear side of the wheelchair, the center line of the longitudinal rod of the headrest device is flush with or exceeds the center line of the obstacle to the left / right, and the left-right infinite adjustment of the headrest device can be realized by turning over the rear connecting block.

[0007] The utility model also provides a headrest assembly, which comprises a headrest pillow, a longitudinal rod along the up-down direction and the above-mentioned headrest connecting assembly. The longitudinal rod is fixed on the first part of the headrest connecting assembly.

[0008] The utility model also provides a wheelchair, which is provided with a transverse rod along the left-right direction on the rear side. The wheelchair also comprises the above-mentioned headrest assembly. The headrest connecting assembly of the headrest assembly is arranged on the transverse rod. BRIEF DESCRIPTION OF DRAWINGS

[0009] Attachment Figures 1 to 6 Shown is the structure of a wheelchair in one embodiment of the present invention.

[0010] Figure 1 The wheelchair is shown before the headrest assembly is installed;

[0011] Figure 2 The wheelchair is shown with the headrest assembly installed;

[0012] Figure 3 shows an assembly drawing of the headrest connection assembly;

[0013] Figure 4 Shown Figure 2 Headrest assembly along Figure 4 The state after translation in the direction of the middle arrow;

[0014] Figure 5 Shown Figure 2 Headrest connection assembly along Figure 5 The state after the direction of the middle arrow is flipped;

[0015] Figure 6 Shown Figure 5 Headrest assembly along Figure 6 The state after translation in the direction of the middle arrow;

[0016] Figure 7 A perspective view of a headrest connection assembly is shown. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and one of the embodiments of the present invention.

[0018] The present invention solves the problem that the longitudinal rod of the headrest device described in the patent document CN201505240U is Figure 1 The installation problem on the rear crossbar 100 of the wheelchair is shown. Figure 1 The crossbar 100 is characterized in that an obstacle such as a pitch adjustment mechanism 200 is mounted on the crossbar 100. If the existing connecting assembly is used, the headrest device cannot be infinitely adjusted relative to the crossbar left and right because the connecting assembly needs to jump over the obstacle during left and right movement.

[0019] See also Figure 3The headrest connecting assembly provided by the utility model comprises a rear connecting block 1, a front connecting block 2, a first locking mechanism and a second locking mechanism, the front connecting block 2 is located at the front side of the rear connecting block 1, the first locking mechanism is used for locking the front connecting block 2 and the rear connecting block 1, the front connecting block 2 and the rear connecting block 1 clamp the rear side cross bar 100 of the wheelchair, and the headrest connecting assembly is prevented from moving and rotating relative to the cross bar 100. The rear connecting block 1 comprises a first part 11 in the left-right direction and a second part 12 in the front-rear direction, the second part 12 is used for being connected with the front connecting block 2, the first part 11 is provided with a clamping structure used for clamping the longitudinal rod 300 of the headrest device, and the second locking mechanism is used for clamping the longitudinal rod 300 of the headrest device by the clamping structure, so that the longitudinal rod 300 of the headrest device is prevented from moving and rotating relative to the rear connecting block 1.

[0020] In the embodiment, the rear connecting block 1 is of L-shaped structure and simple in structure. The first locking mechanism comprises a fastening nut 31 and a fastening bolt 32 which is sequentially penetrated through the second part 12 and the front connecting block 2 from back to front, and the fastening nut 31 is embedded at the front side of the front connecting block 2. Referring to Figure 7 , the clamping structure comprises a through hole 112 which is penetrated through the first part 11 in the up-down direction and a slot 111 which is penetrated through the through hole 112 in the front-rear direction, the slot 111 is oriented to face away from the second part 12, and the through hole 112 is used for penetrating the longitudinal rod 300 of the headrest device. The second locking mechanism comprises a locking bolt 4 which is inserted on the first part 11 from back to front and penetrates the slot 111 at the end away from the slot bottom. The rear end of the locking bolt 4 is a holding structure for facilitating the user to rotate the locking bolt 4. In other embodiments of the utility model, the specific structures of the rear connecting block, the first locking mechanism, the clamping structure and the second locking mechanism can be different from the embodiment, for example, the rear connecting block can be of T-shaped structure.

[0021] By comparison Figure 2 and Figure 4 , after the fastening bolt 32 is loosened, the headrest connecting assembly can be moved to the right along the direction of the arrow in Figure 4 , so that the position of the headrest device is infinitely adjusted to the right. By comparison Figure 2 and Figure 5 , after the headrest device and the fastening bolt 32 are removed, the rear connecting block 1 can be turned over by 180° along the arrow shown in Figure 5 , the front connecting block 2 is reassembled, and the fastening bolt 32 is locked; by comparison Figure 5 and Figure 6 , after the fastening bolt 32 is loosened, the headrest connecting assembly can be moved to the left along the direction of the arrow in Figure 6The middle arrow direction can move the headrest connecting assembly to the left to realize infinite adjustment of the headrest device position to the left. The size of the first part 11 along the left-right direction and the size of the second part 12 along the front-rear direction are designed according to the size of the obstacle on the cross bar 100. As long as the second part 12 is close to the right / left side of the pitch adjustment mechanism 200, the middle line of the headrest device vertical rod 300 is flush with or exceeds the middle line of the pitch adjustment mechanism 200 to the left / right, the headrest device can be infinitely adjusted left and right by turning over the rear connecting block 1.

[0022] In the embodiment, in order to prevent the headrest device vertical rod 300 from rotating relative to the rear connecting block 1, the vertical rod 300 and the through hole 112 adopt a non-circular structure and are left-right symmetrical. In order to prevent the headrest connecting assembly from rotating relative to the rear cross bar 100 of the wheelchair, the cross bar 100 adopts a non-circular structure and is up-down symmetrical. The rear side of the front connecting block 2 and the front side of the rear connecting block 1 are provided with clamping grooves matched with the cross bar 100. The vertical rod 300 and the through hole 112 are left-right symmetrical to avoid mismatching when the vertical rod 300 is inserted into the through hole 112 after the rear connecting block 1 is turned over. The cross bar 100 and the clamping grooves are up-down symmetrical to avoid mismatching between the clamping grooves and the cross bar 100 after the rear connecting block 1 is turned over. In other embodiments of the utility model, other structures can also be used to prevent rotation.

[0023] In the embodiment, in order to facilitate the assembly of the front connecting block 2 and the rear connecting block 1, the front connecting block 2 is up-down symmetrical and the rear connecting block 1 is up-down symmetrical, so that the front connecting block 2 does not need to be turned over according to the rear connecting block 1 during assembly.

[0024] In the embodiment, in addition to the vertical rod 300 along the up-down direction, the headrest device also includes a headrest pillow 500 and a mounting rod 400 along the front-rear direction. A clamping mechanism 301 with adjustable tightness is fixedly arranged at the upper end of the vertical rod 300. The mounting rod 400 is inserted into the clamping mechanism 301 along the front-rear direction. The front end of the mounting rod 400 is connected with the rear side of the headrest pillow 500 through a spherical hinge. The rear end of the mounting rod 400 is provided with an adjusting piece 401 for adjusting the tightness of the spherical hinge. The structure for realizing infinite adjustment of the headrest pillow 500 position front and rear through the clamping mechanism 301 is described in detail in the patent document CN201505240U. The structure for realizing pitch and left-right rotation of the headrest pillow 500 through the spherical hinge and the adjusting piece 401 can refer to the spherical hinge structure adopted in existing mobile phone supports and other products. Mainly, a long bolt is movably arranged in the headrest pillow 500. The larger end of the long bolt is located in the headrest pillow 500, and the smaller end of the long bolt is threadedly connected with the adjusting piece 401. The spherical surface contact is formed between the larger end of the long bolt and the inner side of the headrest pillow 500 and between the outer side of the headrest pillow 500 and the front end of the mounting rod 400. By screwing the adjusting piece 401, the gap of the spherical surface contact can be made larger to facilitate adjustment, or the gap of the spherical surface contact can be made smaller to prevent the headrest pillow 500 from rotating through friction.

[0025] The headrest connecting assembly of the utility model is applicable to any headrest device with a vertical rod, and the vertical rod is connected with the rear side horizontal rod of the wheelchair through the connecting assembly, and is also applicable to any wheelchair with a horizontal rod arranged along the left-right direction at the rear side, and the number of the horizontal rods is unlimited (a corresponding number of headrest connecting assemblies can be arranged), the length of the horizontal rods is unlimited, the position of the horizontal rods is unlimited, and the horizontal rods can have no obstacle (the pitch adjusting mechanism 200) or more obstacles than the number of the embodiment.

Claims

1. A headrest connecting assembly for connecting a headrest device longitudinal rod (300) with a wheelchair rear side crossbar (100), characterized in that: The headrest connecting assembly comprises a rear connecting block (1), a front connecting block (2), a first locking mechanism and a second locking mechanism, the front connecting block (2) is located at the front side of the rear connecting block (1), the first locking mechanism is used for locking the front connecting block (2) and the rear connecting block (1), so that the front connecting block (2) and the rear connecting block (1) clamp the rear side cross bar (100) of the wheelchair, and the headrest connecting assembly is prevented from moving and rotating relative to the cross bar (100); the rear connecting block (1) comprises a first part (11) in the left-right direction and a second part (12) in the front-rear direction, the second part (12) is used for connecting with the front connecting block (2), the first part (11) is provided with a clamping structure for clamping the longitudinal rod (300) of the headrest device, and the second locking mechanism is used for clamping the longitudinal rod (300) of the headrest device by the clamping structure, so that the longitudinal rod (300) of the headrest device is prevented from moving and rotating relative to the rear connecting block (1).

2. The headrest connection assembly of claim 1, wherein: The first locking mechanism comprises a fastening nut (31) and a fastening bolt (32) which penetrates the second part (12) and the front connecting block (2) in sequence from back to front, and the fastening nut (31) is embedded on the front side of the front connecting block (2).

3. The headrest connection assembly of claim 1, wherein: The clamping structure comprises a through hole (112) which penetrates the first part (11) in the up-down direction and a notch (111) which penetrates the through hole (112) in the front-rear direction, the notch (111) faces away from the second part (12), and the through hole (112) is used for penetrating the longitudinal rod (300) of the headrest device; the through hole (112) is a non-circular structure and is left-right symmetrical.

4. A headrest connection assembly as claimed in claim 3, wherein: The second locking mechanism comprises a locking bolt (4) which is inserted into the first part (11) from back to front and penetrates the notch (111).

5. The headrest connection assembly of claim 1, wherein: The rear connecting block (1) is an L-shaped structure.

6. The headrest connection assembly of claim 1, wherein: The rear connecting block (1) is an up-down symmetrical structure, and the front connecting block (2) is also an up-down symmetrical structure.

7. A headrest assembly comprising a headrest pillow (500) and a longitudinal rod (300) in an up-and-down direction, characterized by: The headrest assembly further comprises the headrest connecting assembly according to any one of claims 1 to 6, and the longitudinal rod (300) is fixed to the first part (11).

8. A headrest assembly as claimed in claim 7, wherein: The headrest assembly further comprises a mounting rod (400) in the front-rear direction, a loose adjustable clamping mechanism (301) is fixed to the upper end of the longitudinal rod (300), the mounting rod (400) is inserted into the clamping mechanism (301) in the front-rear direction, the front end of the mounting rod (400) is connected with the rear side central ball of the headrest pillow (500) through a spherical hinge, and the rear end of the mounting rod (400) is provided with an adjusting piece (401) for adjusting the tightness of the spherical hinge.

9. The headrest assembly of claim 7, wherein: The longitudinal rod (300) is a non-circular structure and is left-right symmetrical, and the clamping structure is matched with the longitudinal rod (300).

10. A wheelchair, a crossbar (100) being fixed to a rear side of the wheelchair in a left-right direction, characterized by: The wheelchair comprises the headrest assembly according to any one of claims 7 to 9, and the headrest connecting assembly is arranged on the cross bar (100).

11. The wheelchair of claim 10, wherein: The cross bar (100) is a non-circular structure and is up-down symmetrical; the rear side of the front connecting block (2) and the front side of the rear connecting block (1) are provided with clamping grooves matched with the cross bar (100).

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